岷江上游茂县退化生态系统及人工恢复植被地上生物量及净初级生产力

The Aboveground Biomass and Net Primary Productivity of Degraded and Artificial Communities in Maoxian, Upper Reach of Minjiang River

测定了岷江上游四川茂县退化灌丛和退化草丛及5种人工恢复植被(连香树林、油松林、华山松林、日本落叶林和云南松林)的地上生物量和生产力。灌、草丛生物量生产力采用样方收获法测定,人工林采用生物量回归模型和生产力方程。地上生物量与胸径关系模型的相关性都达到极显著。退化灌丛和草丛的生物量分别为51 06t/hm2和5 76t/hm2,5种人工林的地上生物量在75 8～150 55t/hm2,地上生产力在10 36～18 17t/hm2·a-1。人工恢复植被比退化植被的生物量增加,生产力显著提高。5种恢复模式中云南松、华山松和日本落叶松在当地显示了良好的生长特性,适合在当地退化生态系统恢复中推广。

In this paper discussed biomass of degraded shrub and herbage and aboveground biomass, net primary productivity (NPP)of five artificial forests, Pinus yunnanensis and larix kaempferi and Pinus armandi Franch., Cercidiphyllum japonicum and Pinus Mandii Franch. in Maoxian, upper reach of Minjiang River Sichuan. Biomass and NPP of degraded shrub and herbage were measured in sample method, and artificial forests in regression model and NPP equation. The model between aboveground biomass and DBH is fine because of its high significance. Biomass of degraded shrub and herbage is 51.06 t/hm^(2)and 5.76 t/hm^(2) respectively. Results of biomass and NPP are as follows: aboveground biomass of five artificial forest varies between 75.8 t/hm^(2) ～ 150.55 t/hm^(2); and the aboveground NPP varies between 10.36～18.17 t/hm^(2)·a^(-1). Artificial forests greatly improve the biomass of local ecosystem, and enhance NPP markedly. Model forests of Pinus yunnanensis and arix kaempferi and Pinus armandi Franch. are fit to popularize because of their growth characteristic and high primary productivity.